CN110907719A - Low-voltage line subsection line loss real-time monitoring device and method - Google Patents
Low-voltage line subsection line loss real-time monitoring device and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/088—Aspects of digital computing
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Abstract
The invention relates to a low-voltage line subsection line loss real-time monitoring device and a method, which can accurately measure electric energy among a main node, branch nodes and electric meters in real time, wherein the low-voltage line subsection line loss real-time monitoring device comprises a main node monitoring unit and branch node monitoring units which carry out data interaction and time synchronization through power line carriers, the main node monitoring unit monitors the total electric energy data of a certain region incoming line and information such as voltage, current, power and the like, the branch node monitoring units carry out real-time monitoring on the input electric energy of the installed nodes, simultaneously read the real-time electric energy increment of each electric meter in a downstream meter box, carry out statistical analysis, and compare the electric energy increment of each branch node monitoring unit with the main node monitoring unit.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a low-voltage line segmented line loss real-time monitoring device and method.
Background
In the process of transmitting electric energy, certain loss is caused due to technical reasons, and the loss is called line loss; in addition, errors caused by distribution, measurement and statistics of electric energy can reflect some losses; in addition, the artificial abnormal electricity utilization also causes the loss of electric energy, and the technical or artificial factors bring certain economic loss to the power management.
At present, the low-voltage transformer area in China has numerous and complicated circuits, the phenomenon of private power disconnection is serious, abnormal power utilization behaviors of users are more, and serious economic loss is caused to a power management department. For the power marketing department, in order to strengthen power consumption check strength, standardize power consumption behaviors of users and check line loss indexes of the transformer area, a method of comparing electric quantity of a general meter and a user meter is mostly adopted for checking, the workload of personnel is large, and meanwhile, the actual operation condition of the transformer area cannot be reflected in real time.
The utility model discloses a low pressure distribution transformer, including low-voltage distribution transformer, branch box, table case, the electric energy of node is compared and is found the loss of circuit, and this kind of total amount contrast can take place the node of back location electric energy loss at unusual action, but the real-time is relatively poor, for accurately confirming the line loss scope, fixes a position the unusual user of power consumption, develops a real-time segmentation monitoring devices that can automatic identification line loss, has apparent effect to improving work efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-voltage line subsection line loss real-time monitoring device and method so as to accurately calculate line loss and correctly position an abnormal power utilization line.
In order to solve the above technical problems, the present invention provides a low voltage line segment line loss real-time monitoring device, which comprises a main node monitoring unit and a branch node monitoring unit for performing data interaction and time synchronization through a power line carrier,
the main node monitoring unit is arranged at the wire inlet of the distribution transformer low-voltage wire cabinet or the wire inlet of the branch box or the wire of a line in a certain area, and is used for acquiring the voltage and the current of the line in real time and calculating the impedance, the power and the electric quantity increment;
the branch node monitoring unit is arranged at the inlet wire position of the branch box or the inlet wire position of the meter box or the inlet wire position of the electric meter and is used for acquiring the voltage and the current of the line where the branch node monitoring unit is arranged in real time and calculating the increment of impedance, power and electric quantity; the branch node monitoring unit is also used for acquiring voltage, current, power and electric quantity data of a downstream ammeter and stamping a timestamp on the data;
the branch node monitoring unit is positioned at the downstream of the main node monitoring unit and collects the collected data to the main node monitoring unit for electric quantity increment comparison, and the main node monitoring unit is also used for calculating the actual loss of the line and sending alarm information to the corresponding branch node monitoring unit when judging that the actual loss of the line is greater than a set threshold value, so as to locate an abnormal line.
The branch node monitoring unit is located at the downstream of the main node monitoring unit, specifically, the branch node monitoring unit is located at the downstream of the main node monitoring unit on the line and belongs to the main node monitoring unit.
The branch node monitoring unit sends out a network identification signal through a line, and the main node monitoring unit judges respective subordination relations after receiving the network identification signal.
The actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
The branch node monitoring unit is also used for calculating the actual line loss delta w between the electric meter wiring front and the branch node according to the following formulai：
Wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
The invention also provides a low-voltage line subsection line loss real-time monitoring method which is implemented by the low-voltage line subsection line loss real-time monitoring device and comprises the following steps:
step S1, the branch node monitoring unit sends out network identification signal through the circuit, the main node monitoring unit receives the network identification signal and then judges the respective subordination relation;
step S2, the main node monitoring unit sends out network clock synchronization command through power line carrier, and the branch node monitoring unit synchronizes the time with the main node monitoring unit;
step S3, the main node monitoring unit and the branch node monitoring unit collect the voltage and current of the circuit according to the synchronous clock, and perform power, impedance and electric quantity increment calculation; the branch node monitoring unit also acquires voltage, current, power and electric quantity data of a downstream ammeter of the branch node monitoring unit, and time stamps the data;
step S4, the branch node monitoring unit transmits the collected data to the main node monitoring unit through power line carrier waves, and the main node monitoring unit calculates the actual loss of the circuit;
and step S5, when the actual loss of the line calculated by the main node monitoring unit is larger than the set threshold, the main node monitoring unit sends alarm information to the corresponding branch node monitoring unit, and locates the abnormal line.
The branch node monitoring unit is located at the downstream of the main node monitoring unit on the line and belongs to the main node monitoring unit.
The subordination relation is specifically a main node, a branch node, a meter box node and an electric meter according to the main-slave sequence.
The actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
The branch node monitoring unit is also used for calculating the actual line loss delta w between the electric meter wiring front and the branch node according to the following formulai：
Wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
The embodiment of the invention has the advantages that through the synchronization of the main node monitoring unit and the branch node monitoring unit, the ammeter reads the electric quantity with the timestamp, simultaneously calculates the impedance of the line, eliminates the loss of the line, realizes the real-time calculation of the segmented line loss of the low-voltage line, can position the line with abnormal loss in real time, and reduces the troubleshooting time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a low-voltage line segment line loss real-time monitoring device according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a low-voltage line segment line loss real-time monitoring method according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, an embodiment of the present invention provides a low-voltage line segment line loss real-time monitoring device, including a main node monitoring unit and a branch node monitoring unit, which perform data interaction and time synchronization via power line carriers,
the main node monitoring unit is arranged at the wire inlet of the distribution transformer low-voltage wire cabinet or the wire inlet of the branch box or the wire of a line in a certain area, and is used for acquiring the voltage and the current of the line in real time and calculating the impedance, the power and the electric quantity increment;
the branch node monitoring unit is arranged at the inlet wire position of the branch box or the inlet wire position of the meter box or the inlet wire position of the electric meter and is used for acquiring the voltage and the current of the line where the branch node monitoring unit is arranged in real time and calculating the increment of impedance, power and electric quantity; the branch node monitoring unit is also used for acquiring voltage, current, power and electric quantity data of a downstream ammeter and stamping a timestamp on the data;
the branch node monitoring unit is positioned at the downstream of the main node monitoring unit and collects the collected data to the main node monitoring unit for electric quantity increment comparison, and the main node monitoring unit is also used for calculating the actual loss of the line and sending alarm information to the corresponding branch node monitoring unit when judging that the actual loss of the line is greater than a set threshold value, so as to locate an abnormal line.
In this embodiment, the fact that the branch node monitoring unit is located at the downstream of the main node monitoring unit means that the branch node monitoring unit is located at the downstream of the main node monitoring unit on the line and belongs to the main node monitoring unit, for example, when the main node monitoring unit is installed at the inlet wire of the distribution transformer low-voltage outlet cabinet, the branch node monitoring unit is installed at the inlet wire of the branch box or the inlet wire of the meter box; when the main node monitoring unit is installed at the inlet wire position of the branch box, the branch node monitoring unit is installed at the inlet wire position of the meter box or the inlet wire position of the electric meter. Similarly, when the branch node monitoring unit is installed at the inlet line of the meter box, the branch node monitoring unit collects the voltage, current, power and electric energy data of the downstream electric meters, namely collects the related data of each electric meter in the downstream meter box. The installation site of the main node monitoring unit can be called a main node, and the installation site of the branch node monitoring unit can be called a branch node.
After the main node monitoring unit and the branch node monitoring unit are installed, the branch node monitoring unit sends out a network identification signal through a line, and after the main node monitoring unit receives the network identification signal, the main node monitoring unit judges respective subordination relations, namely the main node, the branch node, the meter box node and the electric meter are specifically determined according to the sequence of the main node, the branch node, the meter box node and the electric meter. Then, the main node monitoring unit sends out a network clock synchronization command through a power line carrier, and the branch node monitoring unit synchronizes the time with the main node monitoring unit. The main node monitoring unit and the branch node monitoring unit can realize clock millisecond synchronization through power line carrier synchronization, and realize synchronous sampling of voltage and current and synchronous calculation of impedance and electric energy on the basis so as to improve the simultaneity of line loss analysis. The main node monitoring unit and the branch node monitoring unit start to respectively collect the voltage and the current of respective lines according to the synchronous clock, and power, impedance and electric quantity increment calculation is carried out on the basis. The AD sampling data of the voltage and the current are calculated to obtain the effective values of the voltage and the current of the line in real time, the impedance of the line is obtained through the change rate of the voltage and the current, and the electric quantity increment of the line is obtained through the accumulation of the product of the voltage and the current.
The branch node monitoring unit reads voltage, current, power and electric energy data of each downstream electric meter, and a timestamp is printed on the data, and the timestamp is used for summarizing the data to the main node monitoring unit at the branch node monitoring unit, so that the main node monitoring unit can synchronously compare electric quantity increments in the same time period. Because the branch node monitoring unit and the main node monitoring unit are in clock synchronization, the data acquired by the main node monitoring unit in real time does not need to be stamped, and the branch node monitoring unit acquires the data according to the time synchronized with the main node monitoring unit, so that the consistency of the metering time is ensured.
Specifically, the actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
Actual line loss delta w between the branch node and the electric meter before wiring calculated by the branch node monitoring unitiThe method is carried out according to the following formula:
wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
It will be appreciated that the physical loss of power (i.e., w) from the line itself may be caused by factors such as switching on the line, line length, aging, etcLi、metLj) In this embodiment, when calculating the actual loss of the line, the physical power loss of the line itself is removed to obtain the real line loss, thereby avoiding the influence of the loss caused by the above factors on the judgment of the abnormal power consumption.
It should be noted that, since the data collected to the master node monitoring unit by the branch node monitoring unit is time-stamped, the master node monitoring unit selects data of each branch node in the same time period when calculating the actual line loss Δ W according to the formula.
Further, the master node monitoring unit calculates an actual line loss Δ W, compares the actual line loss Δ W with a preset threshold, and determines that abnormal power consumption has occurred if Δ W is greater than the threshold. Because the W of the corresponding line is adopted when calculating the delta WiAnd wLiTherefore, the circuit with abnormal electricity utilization can be accurately positioned, and support is provided for further searching the meter box and the electric meter with abnormal electricity utilization on the circuit. Actual line loss delta w between the branch node and the electric meter before wiring calculated by the branch node monitoring unitiAnd the abnormal line loss is also sent to the main node monitoring unit, so that the main node can comprehensively consider the electric energy increment of the main node, the branch node and the electric meter to judge the abnormal line loss. And the calculation and the judgment are finished in real time, so that the simultaneity and the accuracy of line loss monitoring are improved. The actual heat loss of each segmented line can be estimated through impedance calculation of the main node and the branch nodes, the actual heat loss of the line can be obtained through accumulation calculation, and accurate judgment can be made on abnormal line loss.
Correspondingly to the first embodiment of the present invention, the second embodiment of the present invention provides a low-voltage line segment line loss real-time monitoring method, including:
step S1, the branch node monitoring unit sends out network identification signal through the circuit, the main node monitoring unit receives the network identification signal and then judges the respective subordination relation;
step S2, the main node monitoring unit sends out network clock synchronization command through power line carrier, and the branch node monitoring unit synchronizes the time with the main node monitoring unit;
step S3, the main node monitoring unit and the branch node monitoring unit collect the voltage and current of the circuit according to the synchronous clock, and perform power, impedance and electric quantity increment calculation; the branch node monitoring unit also acquires voltage, current, power and electric quantity data of a downstream ammeter of the branch node monitoring unit, and time stamps the data;
step S4, the branch node monitoring unit transmits the collected data to the main node monitoring unit through power line carrier waves, and the main node monitoring unit calculates the actual loss of the circuit;
and step S5, when the actual loss of the line calculated by the main node monitoring unit is larger than the set threshold, the main node monitoring unit sends alarm information to the corresponding branch node monitoring unit, and locates the abnormal line.
The branch node monitoring unit is located at the downstream of the main node monitoring unit on the line and belongs to the main node monitoring unit.
The subordination relation is specifically a main node, a branch node, a meter box node and an electric meter according to the main-slave sequence.
The actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
The branch node monitoring unit is also used for calculating the actual line loss delta w between the electric meter wiring front and the branch node according to the following formulai：
Wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
Furthermore, the actual heat loss of each segmented line can be estimated through impedance calculation of the main node and the branch nodes, the actual heat loss of the line can be obtained through accumulation calculation, and accurate judgment can be made on abnormal line loss.
According to the embodiment of the invention, through the synchronization of the main node monitoring unit and the branch node monitoring unit, the electric meter reads the electric quantity with the timestamp, and simultaneously calculates the impedance of the line, so that the loss of the line is eliminated, the real-time calculation of the sectional line loss of the low-voltage line is realized, the line with abnormal loss can be positioned in real time, and the troubleshooting time is reduced.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A low-voltage line subsection line loss real-time monitoring device is characterized by comprising a main node monitoring unit and a branch node monitoring unit which carry out data interaction and time synchronization through power line carriers,
the main node monitoring unit is arranged at the wire inlet of the distribution transformer low-voltage wire cabinet or the wire inlet of the branch box or the wire of a line in a certain area, and is used for acquiring the voltage and the current of the line in real time and calculating the impedance, the power and the electric quantity increment;
the branch node monitoring unit is arranged at the inlet wire position of the branch box or the inlet wire position of the meter box or the inlet wire position of the electric meter and is used for acquiring the voltage and the current of the line where the branch node monitoring unit is arranged in real time and calculating the increment of impedance, power and electric quantity; the branch node monitoring unit is also used for acquiring voltage, current, power and electric quantity data of a downstream ammeter and stamping a timestamp on the data;
the branch node monitoring unit is positioned at the downstream of the main node monitoring unit and collects the collected data to the main node monitoring unit for electric quantity increment comparison, and the main node monitoring unit is also used for calculating the actual loss of the line and sending alarm information to the corresponding branch node monitoring unit when judging that the actual loss of the line is greater than a set threshold value, so as to locate an abnormal line.
2. The device according to claim 1, wherein the branch node monitoring unit is located downstream of the master node monitoring unit, in particular, the branch node monitoring unit is located downstream of the master node monitoring unit on the line and belongs to the master node monitoring unit.
3. The device for monitoring the segmented line loss of the low-voltage line in real time as claimed in claim 2, wherein the branch node monitoring unit sends out a network identification signal through a line, and the main node monitoring unit judges respective subordination relationships after receiving the network identification signal.
4. The device for monitoring the line loss of the low-voltage line in sections in real time according to claim 1, wherein the actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
5. The device according to claim 4, wherein the branch node monitoring unit is further configured to calculate the actual line loss Δ w between the branch node and the meter before the meter is connected according to the following formulai：
Wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
6. A low-voltage line segment line loss real-time monitoring method implemented by the low-voltage line segment line loss real-time monitoring device according to claim 1, the low-voltage line segment line loss real-time monitoring method comprising:
step S1, the branch node monitoring unit sends out network identification signal through the circuit, the main node monitoring unit receives the network identification signal and then judges the respective subordination relation;
step S2, the main node monitoring unit sends out network clock synchronization command through power line carrier, and the branch node monitoring unit synchronizes the time with the main node monitoring unit;
step S3, the main node monitoring unit and the branch node monitoring unit collect the voltage and current of the circuit according to the synchronous clock, and perform power, impedance and electric quantity increment calculation; the branch node monitoring unit also acquires voltage, current, power and electric quantity data of a downstream ammeter of the branch node monitoring unit, and time stamps the data;
step S4, the branch node monitoring unit transmits the collected data to the main node monitoring unit through power line carrier waves, and the main node monitoring unit calculates the actual loss of the circuit;
and step S5, when the actual loss of the line calculated by the main node monitoring unit is larger than the set threshold, the main node monitoring unit sends alarm information to the corresponding branch node monitoring unit, and locates the abnormal line.
7. The method according to claim 6, wherein the branch node monitoring unit is located downstream of the main node monitoring unit on the line and is subordinate to the main node monitoring unit.
8. The method according to claim 7, wherein the dependency relationship is in master-slave order, in particular, master node-branch node-meter box node-meter table.
9. The method for monitoring the line loss of the low-voltage line in sections in real time according to claim 6, wherein the actual line loss Δ W calculated by the master node monitoring unit is calculated according to the following formula:
wherein, W0Indicating the power increment of the master node, wiRepresents the branch node power increment, wLiThe physical power loss of the line where the branch node is located is shown, and N is the number of the branch nodes.
10. The method according to claim 9, wherein the branch node monitoring unit is further configured to calculate the actual line loss Δ w between the branch node and the meter before the meter is connected according to the following formulai：
Wherein, wiIndicating branch node power increment, metjIndicating the electricity increment of the meter, metLjAnd M represents the physical power loss of the line before the wiring of the electric meters, and is the number of the electric meters.
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| CN113364125B (en) * | 2020-07-01 | 2022-06-17 | 国网山东省电力公司费县供电公司 | Management line loss detection system based on voltage adjustment identification |
| CN111965479A (en) * | 2020-07-02 | 2020-11-20 | 国网上海市电力公司 | Line loss abnormity positioning method based on data fine measurement and comparison |
| CN112505392A (en) * | 2020-11-17 | 2021-03-16 | 广东电网有限责任公司 | Method and system for determining low-voltage electricity stealing point |
| CN112686151A (en) * | 2020-12-29 | 2021-04-20 | 国网四川省电力公司 | Household photo identification method, system and device |
| CN113985204A (en) * | 2021-10-27 | 2022-01-28 | 国网陕西省电力公司铜川供电公司 | Low-voltage line loss segmented supervision method |
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